The term “voltage regulation” is used to discuss long-term variations in voltage. It does not include short term variations, which are generally called sags, dips, or swells.The ability of equipment to handle steady state voltage variations varies from equipment to equipment. The steady state voltage variation limits for equipment is usually part of the equipment specifications. The Information Technology Industry Council (ITIC) specifies equipment withstand recommendations for IT equipment according to the ITI Curve (formerly the CBEMA curve). The 1996 ITI Curve specifies that equipment should be able to withstand voltage variations within ± 10% (variations that last longer than 10 seconds).
Voltage regulation standards in North America vary from state to state and utility to utility. The national standard in the U.S.A. is ANSI C84.1. Voltage regulation requirements are defined in two categories:
Other countries have established different limits, based on the characteristics of their distribution systems: Australia, Japan, etc.
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